Motorola R-2400 Operator's Manual page 17

3.2.3 FUNCTION SWITCH
3.2.3.1 GENERATE FUNCTIONS
The function switch
is
a
four position rotary
switch which permits the
service
monitor to be used
as
an
RF
signal generator specified
from
200
kHz to
999.9999
MHz or
an RF
signal
monitor
specified
from
1
MHz
to
999 .999
MHz.
In
the
"HI
GEN"
(high generate)
function the unit
generates and outputs
an RF
signal and
is
capable
of
200
uV to
1
VRMS output
on
any
frequency
within the
specified range. The
1
volt
output level is sufficient
for
transmission through
an
antenna connected
to the
antenna connector.
In
the
"GEN"
(generate) function the unit
generates an
RF
signal
for
direct connection to the antenna input of
the
equipment under
service
with output
levels
from
.1
uV to
200
uV.
3.2.3.2 MONITOR FUNCTIONS
The "SENS MON"
(sensitive monitor) function
allows the unit to monitor
low
level signals. The
1.5
microvolt sensitivity allows
off
the air monitoring of
a remote transmitter's frequency
error and deviation/0/o modulation
(of
modulated
car-
riers). Hookup
is made
to the "ANTENNA" connector.
Selecting the
"PwR MoN"
(power monitor) function
permits the
service
monitor to
operate as
an RF watt-
meter, allowing direct output power measurement of
transmitters
within
the range
of
.5
to
125
watts.
Fre-
quency error and
deviation/
t/o modulation
measure-
ments are also available in
the
"PwR MON"
function.
Hookup is
made
to the "RF IN/OUT"
connector. The
R-2400 has
two additional function
switch positions,
"Anlzr
Sens
Mon"
and
"Anlzr Pwr Mon" which
are used
to
enter
the
analyzer mode
of operation. In "Anlzr
Sens
Mon", the
signal applied
to
the "Antenna" input
is
displayed.
In "Anlzr
Pwr Mon", the
signal
applied to
the
"RF
Inlout"
input
is
displayed.
All
other functions
are the same as
for "Pwr Mon"
and
"Sens
Mon".
3.3.0 [,IQUID CRYSTAL DISPLAY MODE
SELECT
Notice the cursor controls
tr
on the left
and right
LCD's.
These controls select the various measurement
modes.
Each time the cursor control is depressed
the
annunciator
DOT
located
on the left
side
of
each
LCD
screen
will
move and
an
audible feedback
tone
will verify
actuation. The equipment is programmed
to
suppress
measurement
modes
not relevant to the
selected service
monitor function. For example, when in the "GENER-
ATE"
function, frequency error
and
power (on the right
LCD)
cannot be
accessed.
This
reduces
operation time
and
increases
productivity.
See
table
1
for
software de-
fined
selections.
3.3.1 LIQUID CRYSTAL
DISPLAYS
3.3.1.I ANALOG METER BARS/DIGITAL
DISPLAYS
As
shown
in fig.
3-2
the LCD's provide
autoranging
analog and digital
displays.
Digital
displays provide
accuracy and autoranging meter
bars
assist
during peak-
ing
and dipping maintenance adjustments. To provide
efficient operation
the
digital
readouts of selected modes
TABLE 3-I
FU N
CTIO
N
SWITCH
POSITION
ACCEPTABLE
M
EA.
SUREMENT
MODE
SUPPRESSED MEA-
SUREMENT
MODE
GEN ERATE
HI
GENERATE
DEVIATION ALARM
DEV/%AM
DVM
DISTORTION
SI NAD
BATTERY VOLTAGE
RF
LEVEL
FREO
ERROR
POWER
POWER MON ITOR
OR
ANALYZER
POWER
MON ITOR
DEVIATION ALARM
DEV/%AM
DVM
DISTORTION
POWER
FREO
ERROR
BATTERY VOLTAGE
SINAD
RF
LEVEL
SENS
ITIVE
MON ITOR
OR
ANALYZER
SEN
SITIVE
MON ITOR
DEVIATION ALARM
DEV/%AM
DVM
DISTORTION
FREO
ERROR
BATTERY VOLTAGE
SI NAD
POWER
RF LEVEL
are
presented at the
same
time
as
analog displays.
With
display modes selected
for RF
signal measurements
such
as
FM deviation or frequency error,
the meter
bars
oper-
ate about
a center
point
and show symmetrical
or
non-
symmetrical
deviation
or drifting
about the center fre-
quency.
In "%oAM", the meter bar
graph operates about
a
center
point and
shows
positive and negative percent-
age
of amplitude modulation. Other disflay
mode ana-
log meter bars (distortion, power) have zero reference
on the left with autoranging meter
bar displays increasing
to
the
right. SINAD
has a
"reverse" meter
bar
graph. As
SINAD
values get larger
in
a
range of
0-20
dB the meter
bar graph
gets smaller.
The voltmeter display,
"DVM",
has
left to right meter
bars
for all AC
signals and
positive
DC
signals.
For
negative
DC
signals,
the
meter
bars
move
right to left with
zero reference at the right.
3.3.1.2 SPECIAL DISPLAY SELECT SWITCHES Three
special membrane switches are provided to control the
digital volt meter, RF level and deviation/percent
AM
modes.
The
tr
is used
to
select
the FM deviation or
AM
modulation positive
or
negative peaks.
In
the
"DEVIVoAM"
measurement
mode, deviation is auto-
matically selected
if
in FM
and VoAM is automatically
selected
if
in
AM.
The
m
is used
to
select
the display
for
either
AC or
DC
voltages and
the
@
provides
the
"RF
LEVEL"
digital readout
in
volts or dBm.
These
keys
will
respond only when the
associated
function
is
active.
\-/
\-/
3-2
\.-,